Valve for aeroplane engines



N0V- 27, 1934 F. A. THAHELU 1,982,126

VALVE FOR AEROPLANE ENGINES Filed March `19, 1952 I attain,

constructed in Patented Nev. 27, 1.934

1,982,126- vALvn non ennorrrnnn ENGINES Ferl A. Thalield, Dallas, Tex., assigner to Guiberson Diesel Engine (Company, Dover, Del., a cerporation of Delaware Application March 19, 21982, Serial No.

2 Claims. im, 1123-90) This invention relates to new and useful improvements in valves for aeroplane engines,

One object improved rocker box for enclosing the valve rock ers on the outer end of an engine cylinder, whereby certain advantageous and novel results are obtained.

An important object of the invention is to provide an improved box for encasng a pair of rock ers on the outer end of an air cooled engine cylinder; such box having a stream-line shape, thus reducing head resistance.

A further object of the invention is to provide a rocker box having a stream-line shape and positioned at such an angle to the direction of flight as to reduce the resistance of the slip stream of the propeller.

Another object of the invention is to provide a valve structure, whereby the air intake may be so located that its longitudinal axis will be substantially alined with the slip stream of the propeller.

A construction designed to carry out the invention will be hereinafter described together with other features of the invention.

The invention will be more readily understood from a reading of the following specication and by reference to the accompanying drawing in which an example of the invention' is shown, and wherein:

Figure 1 is a plan View of a valve structure accordance with the invention, and

Figure 2 is a vertical sectional View taken on the line 2 2 of Figure 1.

In the drawing the numeral designates the cylinder of an internal combustion engine having a piston 11 working therein. In the head of the cylinder an air-inlet valve seat 12 is formed on one side of the center, while an exhaust valve seat 13 is formed on the opposite side of said center.

A housing 14 formed with an annular collar 15 is fitted snugly on the head of the cylinder and fastened in any suitable manner. This housing has cooling ribs or ns 16 on its upper surface, an air intake barrel 17 and an exhaust barrel 18. The barrels are made integral with the housing. The inner end of the barrel 17 communicates with the valve seat 12 through an opening 17 in the housing registering with said seat and the barrel 18 communicates with the Seat 13 through an opening 18 in the housing registering with said seat.

Guide bushings 19 are arranged in the tops of of the invention is to provide an the barrels 17 and 18 centrally above the seats 12 and 13. An intake valve 20 opening into the cylinder l0 engages the seat 12 and has an upwardly extending stem 2l slidable in one of the guides 19. An exhaust valve 22 opening into the cylinder engages the seat 13 and has a stem 23 slidable through the other bushing 19. On the upper end of each valve stem I secure a circular retainer 24 and mount a similar retainer 25 on each bushing. Coiled springs 26 surrounding the stems are confined between the retainers and act to-hold the Valves seated.

The springs are conned in an elliptical rocker box 27 supported on and` made integral with the barrels 17 and 18. The rear portion of this box overhangs the cylinder, as is indicated at 28. The upper end of a guard tube 29 is secured in the bottom of the overhanging portion 28. Push rods 30 and 3l extend through this tube into the box.

A long rocker arm 32 and a short rocker arm 33 are journaled on ball bearings 34 carried by a transverse bolt 35 extending through the rear portion of the box. Tappet screws 36 mounted in the rear ends of the arms engage tappets 37 mounted in the upper ends of the push rods. The short arm 33 has a roller 33 at its forward end engaging on the upper end of the stern 23, while the long arm 32 has a roller 32 bearing on the upper end of the stern 21.

It will be seen that when the push rod 30 is elelated the arm 32 will be rocked and the stem 21 depressed, whereby the intake valve 20 will be opened. When the push rod 31 is elevated the arm 33 will be rocked, whereby the exhaust Valve 22 will be opened. A flanged lid 38 is snugly iitted on the top of the box and may be suitably fastened.

It is pointed out that both rocker arms are mounted in one box and this box is given an elongated stream-line shape. The box is disposed at such an angle to the direction of flight of the aeroplane and also to the direction of the slip stream from the propeller as to offer the least head resistance. Such an arrangement not only tends to reduce weight, but saves material and makes for greater enciency.- It takes the place of two rocker boxes and permits both push rods to be mounted in one guard tube. The arrangement of the box also permits the 17 to be aligned with the direction of the slip stream from the propeller, thus making for greater eciency in supplying air to the cylinder.

Various changes in the size and shape o'f the dierent parts, as well as modifications and alintake barrel terations, m'a'y 'be made within the scope of the appended claims Having illustrated and described a preferredv form of the invention, what I claim, is:

1. The combination with an aeroplane engine, of an elongated rocker box mounted on said cylinder and having its longitudinal axis alined with the slip stream of the propeller, and an air intake conductorv between the box and the cylinder also alined with the slip stream of the propeller.

FERIA. THAHELD. 

